IPhone : Access Data from dictionary

Get data from Webservice like this,

 {
   firstCategory = (

  {
     “name” = “first”
  },
  {
     “name” = “second”
  },
  {
     “name = third”
  }
);
secondCategory = (
  {
     “name” = “fifth”
  },
  {
     “name” = “sixth”
  },
  {
     “name = “seventh”
   }
);

}

i want to fetch data from dictionary and store into two different array.first category data into first array and second category data into second array.